The Sphingosine and Acyl Chains of Ceramide [NS] Show Very Different Structure and Dynamics That Challenge Our Understanding of the Skin Barrier.

Angewandte Chemie
Oskar EngbergK Vávrová

Abstract

The lipid phase of the uppermost human skin layer is thought to comprise highly rigid lipids in an orthorhombic phase state to protect the body against the environment. By synthesizing sphingosine-d28 deuterated N-lignoceroyl-d-erythro-sphingosine (ceramide [NS]), we compare the structure and dynamics of both chains of that lipid in biologically relevant mixtures using X-ray diffraction, 2 H NMR analysis, and infrared spectroscopy. Our results reveal a substantial fraction of sphingosine chains in a fluid and dynamic phase state at physiological temperature. These findings prompt revision of our current understanding of the skin lipid barrier, where an extended ceramide [NS] conformation is preferred and a possible domain structure is proposed. Mobile lipid chains may be crucial for skin elasticity and the translocation of physiologically important molecules.

References

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Citations

Nov 17, 2020·Frontiers in Physiology·Oskar EngbergDaniel Huster
Mar 7, 2021·The Journal of Investigative Dermatology·Anna NováčkováKateřina Vávrová
Aug 21, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Charlotte M BeddoesJoke A Bouwstra

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Methods Mentioned

BETA
X‐ray
NMR

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